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Cisco introduced IOS Zone-Based Firewalling (ZFW) in Cisco IOS 12.4(6)T. Cisco announced that their strategic direction for IOS firewalling is going to be with Zone-Based Firewalling. They will continue to support Classic IOS Firewall, but all the new developments will be through Zone-Based Firewalling. Zone-Based Firewall changes the IOS stateful inspection model from Classic Firewall’s […]

The Cisco IOS Classic Firewall implements stateful inspection of traffic flow through the router. The router intercepts packets that it has been configured to intercept, and tracks the state of the packets and compares them against patterns of normal behavior. The IOS code understands the way that specific protocols operate, and IOS provides support for […]

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